https://jshd.pubs.asha.org/article.aspx?articleid=1775618Acoustical Effects of Endotracheal IntubationCertain acoustical consequences of endotracheal intubation were examined in 13 male cardiovascular-surgery patients. Each subject recorded three tokens of a sustained vowel 1 day before intubation, 1 day after, upon discharge, and during a follow-up visit. Eight acoustical measures were obtained from the audio-recorded vowels: (a) mean fundamental frequency (Fo), ...1990-08-01T00:00:00ReportsTracey A. Yonick